Analysis

  • max time kernel
    150s
  • max time network
    119s
  • platform
    windows7_x64
  • resource
    win7-20240220-en
  • resource tags

    arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
  • submitted
    15-03-2024 21:21

General

  • Target

    Gruel.exe

  • Size

    100KB

  • MD5

    b0feccddd78039aed7f1d68dae4d73d3

  • SHA1

    8fcffb3ae7af33b9b83af4c5acbb044f888eeabf

  • SHA256

    5714efd4746f7796bbc52a272f8e354f67edfb50129d5fdaa1396e920956d0d6

  • SHA512

    b02b9476eeb9c43fcfef56949f867c1c88f152d65f3961a2838b8bff02df2383945aefb9a8c517ac78d79b5a9163c7677f5b6238f4624b1966994c9c09eb428d

  • SSDEEP

    1536:ThBfyxwMz14BSSQGRwmkwmGDAzGC6TaPAlbv/g:1BKxwMz14wSQGGUDAATaPAlbv/g

Score
7/10

Malware Config

Signatures

  • Modifies system executable filetype association 2 TTPs 5 IoCs
  • Adds Run key to start application 2 TTPs 3 IoCs
  • Enumerates connected drives 3 TTPs 1 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies Control Panel 3 IoCs
  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
  • Modifies registry class 29 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Gruel.exe
    "C:\Users\Admin\AppData\Local\Temp\Gruel.exe"
    1⤵
    • Modifies system executable filetype association
    • Adds Run key to start application
    • Enumerates connected drives
    • Drops file in Windows directory
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2924
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe shell32.dll,Control_RunDLL mmsys.cpl @1
      2⤵
        PID:2700
      • C:\Windows\SysWOW64\rundll32.exe
        rundll32.exe shell32.dll,Control_RunDLL netcpl.cpl
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2676
        • C:\Windows\system32\RunDll32.exe
          C:\Windows\system32\RunDll32.exe Shell32.dll,Control_RunDLL netcpl.cpl
          3⤵
            PID:2748
        • C:\Windows\SysWOW64\rundll32.exe
          rundll32.exe shell32.dll,Control_RunDLL mmsys.cpl,,0
          2⤵
            PID:2776
          • C:\Windows\SysWOW64\rundll32.exe
            rundll32.exe shell32.dll,Control_RunDLL main.cpl @0
            2⤵
              PID:2920
            • C:\Windows\SysWOW64\rundll32.exe
              rundll32.exe shell32.dll,Control_RunDLL modem.cpl
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:1452
              • C:\Users\Admin\AppData\Local\Temp\Gruel.exe
                "C:\Users\Admin\AppData\Local\Temp\Gruel.exe" C:\Windows\system32\rundll32.exe
                3⤵
                • Modifies registry class
                • Suspicious use of SetWindowsHookEx
                PID:2672
            • C:\Windows\SysWOW64\rundll32.exe
              rundll32.exe shell32.dll,Control_RunDLL main.cpl @1
              2⤵
                PID:2532
              • C:\Windows\SysWOW64\rundll32.exe
                rundll32.exe shell32.dll,Control_RunDLL sysdm.cpl @1
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:2424
                • C:\Users\Admin\AppData\Local\Temp\Gruel.exe
                  "C:\Users\Admin\AppData\Local\Temp\Gruel.exe" C:\Windows\System32\SystemPropertiesComputerName.exe
                  3⤵
                  • Modifies registry class
                  • Suspicious use of SetWindowsHookEx
                  PID:2452
              • C:\Windows\SysWOW64\rundll32.exe
                rundll32.exe shell32.dll,Control_RunDLL appwiz.cpl,,1
                2⤵
                  PID:1648
                • C:\Windows\SysWOW64\rundll32.exe
                  rundll32.exe shell32.dll,Control_RunDLL timedate.cpl
                  2⤵
                    PID:2896
                  • C:\Windows\SysWOW64\rundll32.exe
                    rundll32.exe shell32.dll,Control_RunDLL desk.cpl,,0
                    2⤵
                    • Modifies Control Panel
                    PID:2408
                  • C:\Windows\SysWOW64\rundll32.exe
                    rundll32.exe shell32.dll,Control_RunDLL inetcpl.cpl,,0
                    2⤵
                      PID:2132

                  Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

                  • C:\Rundll32.exe

                    Filesize

                    100KB

                    MD5

                    b0feccddd78039aed7f1d68dae4d73d3

                    SHA1

                    8fcffb3ae7af33b9b83af4c5acbb044f888eeabf

                    SHA256

                    5714efd4746f7796bbc52a272f8e354f67edfb50129d5fdaa1396e920956d0d6

                    SHA512

                    b02b9476eeb9c43fcfef56949f867c1c88f152d65f3961a2838b8bff02df2383945aefb9a8c517ac78d79b5a9163c7677f5b6238f4624b1966994c9c09eb428d

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\Themes\Custom.theme

                    Filesize

                    1KB

                    MD5

                    159bd6a587f370f16522b2a6f690bcc3

                    SHA1

                    c07d14fc439997e2f65b982c0702a985b36b9cf8

                    SHA256

                    9193c9b28f4e19c5fbd00340dce578825fbc6ce6ab67b1c9082c0d8f64446993

                    SHA512

                    a1ddc058193d778b3935ef8f158bb06f014de72124d5561a4d7af99e77921bcfe5ffcb24a1375917d5e438e0f2a1dccb96c1bdc2fa5b6aaf75ca5cabe1788e46

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\Themes\Custom.theme

                    Filesize

                    1KB

                    MD5

                    d835de730c2496708378bf3dce10892e

                    SHA1

                    591faf986469a03f8d46f5b53a3ebf1eaa67a1c7

                    SHA256

                    2157e9cd768423a4c6a6532cc34fa1b40e9766ee41dad15a7266474c57095bc1

                    SHA512

                    a97e55f7196ffab77e1301884908008cd3c0b10fdf4aa48b120060cb26f911f90a3a0a424e38998974aa874776d7442ba8fdce7128fbbddac5e3fce6c3c7ecc8

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\Themes\Custom.theme

                    Filesize

                    1KB

                    MD5

                    7c048eaacd1820ac933dccc0b872fa05

                    SHA1

                    955999eb7463f7e4031d551e24fbd1e1fb812197

                    SHA256

                    614d7a9ca519b3aa741a512e95f6f99aedd25e8c1630d30d13dd9735b562b3be

                    SHA512

                    09f35a1a69344e64b13f0a54ecc82cd7dd1ee9124bfc274fcd5fe8af2a07e30bbf0841d9230591cbbe12bc8f066f5f36e1577b82d5d1f3f0eb6b9b5154ce5d4b

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\Themes\Custom.theme

                    Filesize

                    1KB

                    MD5

                    05471356f0ea1c0f5f5b8deb29c3ebd1

                    SHA1

                    12b14b737d1e0f76ca2494fb7a6841e5792a0504

                    SHA256

                    cf59479c75a8803468dd2a2c1d2803a2694c41992d5a0b3b65b1c69c28d1eac7

                    SHA512

                    942285259612792c2b3a45a65483e0775314841e397e815d447fd8f69f63f5de1ac48653a051c0121bd73415655c468772d39ce72bb1ba3d8ae367f78143502b

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\Themes\Custom.theme

                    Filesize

                    1KB

                    MD5

                    b65aeb1b3da0b96313cc6e10dde4afe0

                    SHA1

                    34039989280d6d5a45793deaab79665c79b74b8d

                    SHA256

                    0254d776e25aeb83f195aacc7d477cd37683932586b27fdb7f09836d08296a3c

                    SHA512

                    be5c22848ee3491061feaab9c8e708e04e5d34bc0d8b46e816e059e6616c0114cfe5f40aee935f9d5dee546a990efa3bca00bdec03bcc29fedad37d0dbda95ea